package main

import (
	"flag"
	"io/ioutil"
	"log"
	"time"

	"golang.org/x/oauth2/google"
	"google.golang.org/api/calendar/v3"
)

var calName = flag.String("calendar", "", "name of calendar")
var days = flag.Int("days", 0, "number of days in the future")

func main() {
	flag.Parse()

	b, err := ioutil.ReadFile("credentials.json")
	if err != nil {
		log.Fatal(err)
	}

	// If modifying these scopes, delete your previously saved token.json.
	config, err := google.ConfigFromJSON(b, calendar.CalendarScope)
	if err != nil {
		log.Fatal(err)
	}
	client, err := getClient(config)
	if err != nil {
		log.Fatal(err)
	}

	srv, err := calendar.New(client)
	if err != nil {
		log.Fatal(err)
	}

	calendars, err := srv.CalendarList.List().Do()
	if err != nil {
		log.Fatal(err)
	}
	var myCal *calendar.CalendarListEntry
	for _, item := range calendars.Items {
		if item.Summary == *calName {
			myCal = item
			break
		}
	}
	if myCal == nil {
		log.Fatalf("calendar '%s' not found", *calName)
	}

	loc, err := time.LoadLocation("US/Pacific")
	if err != nil {
		log.Fatal(err)
	}

	now := time.Now().In(loc)

	for i := 0; i < *days; i++ {
		date := now.Add(time.Duration(i * 24) * time.Hour)

		for _, class := range classes {
			if !class.happensOnDay(date) {
				continue
			}

			ev := class.buildEvent(date)

			_, err := srv.Events.Insert(myCal.Id, ev).Do()
			if err != nil {
				log.Fatal(err)
			}
		}
	}


	/*
	ev := &calendar.Event{
		Summary: "Test event",
		Start: &calendar.EventDateTime{
			DateTime: "2020-09-09T16:00:00",
			TimeZone: "US/Pacific",
		},
		End: &calendar.EventDateTime{
			DateTime: "2020-09-09T17:00:00",
			TimeZone: "US/Pacific",
		},
		Attendees: []*calendar.EventAttendee{
			&calendar.EventAttendee{
				Email: "oliver.park@heliosns.org",
			},
		},
	}

	res, err := srv.Events.Insert(myCal.Id, ev).Do()
	if err != nil {
		log.Fatal(err)
	}

	log.Printf("%#v", res)
	*/

	/*
	t := time.Now().Format(time.RFC3339)
	events, err := srv.Events.List(myCal.Id).ShowDeleted(false).
		SingleEvents(true).TimeMin(t).MaxResults(250).OrderBy("startTime").Do()
	if err != nil {
		log.Fatal(err)
	}

	for _, item := range events.Items {
		date := item.Start.DateTime
		if date == "" {
			date = item.Start.Date
		}
		log.Printf("%v (%v)", item.Summary, date)
	}
	*/
}